linux-kernel - [PATCH v2 1/2] mfd: stmpe: support gpio over irq under device tree

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Date:	Fri, 12 Sep 2014 11:18:33 +0800
From:	Sean Cross <xobs@...agi.com>
To:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org,
	Randy Dunlap <rdunlap@...radead.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Cc:	bunnie@...agi.com, Sean Cross <xobs@...agi.com>
Subject: [PATCH v2 1/2] mfd: stmpe: support gpio over irq under device tree

The stmpe_platform_data has a irq_over_gpio field, which allows the
system to read STMPE events whenever an IRQ occurs on a GPIO pin.
This patch adds the ability to configure this field and to use a GPIO
as an IRQ source for boards configuring the STMPE in device tree.

Signed-off-by: Sean Cross <xobs@...agi.com>
---
 drivers/mfd/stmpe.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index 3b6bfa7..4c42b05 100644
--- a/drivers/mfd/stmpe.c
+++ b/drivers/mfd/stmpe.c
@@ -1122,7 +1122,12 @@ static void stmpe_of_probe(struct stmpe_platform_data *pdata,
 	if (pdata->id < 0)
 		pdata->id = -1;
 
-	pdata->irq_trigger = IRQF_TRIGGER_NONE;
+	pdata->irq_gpio = of_get_named_gpio_flags(np, "irq-gpio", 0,
+				&pdata->irq_trigger);
+	if (gpio_is_valid(pdata->irq_gpio))
+		pdata->irq_over_gpio = 1;
+	else
+		pdata->irq_trigger = IRQF_TRIGGER_NONE;
 
 	of_property_read_u32(np, "st,autosleep-timeout",
 			&pdata->autosleep_timeout);
-- 
2.1.0

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